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Effect of Colloidal Probe Random Surface Features on Adhesion



Seung H. Yang, Stephen M. Hsu


We have uncovered the fact that colloidal probes often have random surface features which when not properly accounted for, can significantly affect the magnitudes of the measured adhesive forces using atomic force microscopes (AFM). Colloidal probes have been used to measure the pull-off forces between the probe and surfaces. We prepared a series of colloidal probes by attaching glass spheres (radii of 3.3 um to 17.4 um) to the end of AFM cantilevers. Adhesive force between the probes and a silicon wafer surface was measured using an AFM under various loads from 6 nN to 100 nN in dry air. Results showed that the values of the pull-off forces did not correlate with the radii of the probes. Direct imaging of the glass sphere surface using a sharp tip revealed substantial random surface features which altered the size of real contact areas. We extracted the load-bearing areas from the topography data and used them to normalize the adhesion data. The measured adhesive force, after being normalized, was found to be independent of the load and the sphere radii, in agreement with prevailing contact mechanics theory.
Proceedings Title
Proceedings| III
Conference Dates
September 12-16, 2005
Conference Location
Conference Title
World Tribology Congress


adhesion, AFM, bearing area, colloidal probe, surface roughness


Yang, S. and Hsu, S. (2017), Effect of Colloidal Probe Random Surface Features on Adhesion, Proceedings| III, Undefined (Accessed February 22, 2024)
Created February 19, 2017